fix(did-provider-key): align did:key resolver to spec

[mirceanis]

What issue is this PR fixing

fixes #1330

What is being changed

The did:key resolver implementations imported from transmute resolved to outdated Verification method formats. This PR replaces those dependencies with a local implementation that also adheres better to the spec for defaults and behavior.

The verification methods default to JsonWebKey2020, unless otherwise specified through the options.publicKeyFormat parameter. This implementation also supports options.enableEncryptionKeyDerivation, defaulting to true, that triggers the expression of the corresponding X25519 keyAgreement key for an Ed25519 public key.

This implementation supports Ed25519, X25519, Secp256k1, and P-256 key types for did:key.

Quality

Check all that apply:

• [X] I want these changes to be integrated
• [X] I successfully ran pnpm i, pnpm build, pnpm test, pnpm test:browser locally.
• [X] I allow my PR to be updated by the reviewers (to speed up the review process).
• [X] I added unit tests.
• [ ] I added integration tests.

Notes

This PR is based on #1331, as changing the default verification methods in did:key triggers the corner case signaled in #1329 and fixed in #1331

[codecov-commenter]

Codecov Report

Attention: 25 lines in your changes are missing coverage. Please review.

Comparison is base (7896cea) 89.83% compared to head (1df297e) 89.84%.

Files	Patch %	Lines
packages/did-provider-key/src/resolver.ts	91.33%	24 Missing :warning:
...s/credential-ld/src/suites/JsonWebSignature2020.ts	66.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## next #1332 +/- ## ========================================== + Coverage 89.83% 89.84% +0.01% ========================================== Files 176 176 Lines 27010 27278 +268 Branches 2120 2164 +44 ========================================== + Hits 24265 24509 +244 - Misses 2745 2769 +24 ```

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